WO2023010885A1 - Glass kiln combustion process having non-catalytic converter - Google Patents

Abstract

Disclosed is a glass kiln combustion process having a non-catalytic converter. A required system comprises a glass kiln, a non-catalytic converter A/B, a flue gas recovery device, a chimney, a high temperature flue gas fan, a natural gas supply device, and an oxygen supply device. According to the present invention, some glass kiln flue gas is circulated, which increases the water vapor and carbon dioxide concentrations of the circulating flue gas, the water vapor and the carbon dioxide in the circulating flue gas are subjected to a conversion and reforming reaction with natural gas in a non-catalytic converter, high-heat-value water gas of over 1300℃ is generated while high temperature flue gas sensible heat is recovered, the total heat value of the gas entering the glass kiln and the temperature of the gas entering the glass kiln are increased, and the high-heat-value water gas, a small amount of unreacted natural gas and oxygen are fully burned in the glass kiln, reducing fuel consumption, and improving heat recovery efficiency. The present invention has excellent performance in increasing production, saving energy and reducing emissions, and can reduce heat consumption unit consumption and comprehensive energy consumption, increase yield, reduce flue gas emissions, and achieve ultra-low NOx emissions.

Description

A glass kiln combustion process with a non-catalytic converter technical field

The invention relates to the technical field of glass kiln combustion, in particular to a glass kiln combustion process with a non-catalytic conversion furnace.

Background technique

As global warming touches various aspects such as ecological security, water resource security, and food security, it intensifies the risk of extreme climate disasters and seriously threatens the living environment of human beings. The emission of greenhouse gases is the most important factor causing global warming, and the greenhouse effect produced by carbon dioxide accounts for more than 70% of all greenhouse gases. Therefore, the reduction of carbon dioxide emissions is an urgent problem to be solved. Warmth is crucial.

With the imbalance of global energy supply and the aggravation of geopolitical crisis, fuel prices continue to rise, and the cost of glass production is getting higher and higher. At the same time, the requirements for energy saving and emission reduction of production enterprises are getting higher and higher. Analysis and research on the existing combustion system, using air for combustion, nitrogen is heated needlessly and discharged into the atmosphere at high temperature, resulting in a large amount of heat loss, and nitrogen also reacts with oxygen at high temperature to generate _NOx , and _NOx gas is discharged into the atmosphere The atmosphere is very easy to form acid rain and cause environmental pollution.

The present invention changes terminal treatment into source treatment, reduces carbon dioxide emissions, and realizes a fundamental breakthrough in ultra-low emission of nitrogen oxides.

Contents of the invention

The purpose of the present invention is to provide a glass kiln combustion process with a non-catalytic converter to solve the deficiencies in the prior art.

The present invention adopts following technical scheme:

A glass kiln combustion process with a non-catalytic converter. The system required for combustion includes a glass kiln, a non-catalytic converter A, a non-catalytic converter B, a flue gas recovery device, a chimney, a high-temperature flue gas fan, and a natural gas supply device and oxygen supply;

Non-catalytic converter A and non-catalytic converter B are located on both sides of the glass furnace and communicated with the glass furnace; non-catalytic converter A, non-catalytic converter B and the inlet of the flue gas recovery device are switched and connected, and the outlet of the flue gas recovery device Connect to the chimney and the high-temperature flue gas fan respectively, and switch between the high-temperature flue gas fan and the bottom of the non-catalytic converter A and the bottom of the non-catalytic converter B;

The natural gas supply device is connected to the bottom of non-catalytic converter A, the upper part of non-catalytic converter A, the bottom of non-catalytic converter B, the upper part of non-catalytic converter B, and the glass furnace,

Oxygen supply device and glass furnace connection;

An oxygen content analyzer, flow meter, temperature sensor and pressure sensor are installed on the pipeline connecting the high-temperature flue gas fan and the bottom of non-catalytic converter A and the bottom of non-catalytic converter B; the natural gas supply device and the bottom of non-catalytic converter A and non-catalytic A flow regulating valve and a pressure sensor are installed on the upper part of the reformer A, the bottom of the non-catalytic reformer B, the upper part of the non-catalytic reformer B, and the pipeline connected to the glass furnace, and the flow regulating valve and the Pressure Sensor;

Combustion includes the following steps:

1) At the initial stage, air is used to support combustion. After the flue gas is generated, the circulating flue gas and oxygen are used as a combustion aid to gradually replace the air for combustion. After a period of circulation, the circulating flue gas is rich in water vapor and carbon dioxide, and the circulating flue gas Oxygen completely replaces air for combustion, and the system enters a normal operating state;

2) Conversion and reforming stage: when the oxygen content in the circulating flue gas is less than or equal to the set content limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A, and the natural gas also enters the furnace from the bottom of the non-catalytic converter A , the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo conversion and reformation reactions to generate hydrogen and carbon monoxide, that is, high calorific value water gas, which is sent to the glass furnace, oxygen is sent to the glass furnace, and the carbon monoxide and carbon monoxide generated by the non-catalytic conversion of oxygen and Hydrogen and a small amount of natural gas that has not undergone conversion and reforming reactions undergo combustion reactions in the glass furnace; when the oxygen content in the circulating flue gas is greater than the set content limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic reformer A, and the natural gas Entering the furnace from the upper part of the non-catalytic converter A, the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo conversion and reformation reactions to generate hydrogen and carbon monoxide, namely high calorific value water gas, which is sent to the glass kiln, and oxygen is sent to the glass kiln , Oxygen, carbon monoxide and hydrogen generated by non-catalytic conversion, and a small amount of natural gas that has not undergone conversion and reforming reactions undergo combustion reactions in the glass kiln;

3) Flue gas purging stage: After the conversion and reforming stage, the natural gas is switched to directly enter the glass kiln, and the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A to purge and replace the residual combustible gas, and then enters the glass kiln Furnace, oxygen is sent into the glass kiln, and a combustion reaction occurs;

4) Heating stage of the reforming furnace: During the reforming and reforming stage and the flue gas purging stage, the high-temperature flue gas from the outlet of the glass kiln enters the non-catalytic reforming furnace B to heat up and store heat in the furnace, and then enters the flue gas recovery device to recover heat , dust removal and desulfurization, the latter part is pressurized by the high-temperature flue gas fan and then introduced into the non-catalytic converter A for circulation, and the rest is vented by the chimney or CCUS;

5) After a certain period of time, the non-catalytic converter A/B is switched, that is, the non-catalytic converter B undergoes conversion and reforming reactions, and the non-catalytic converter A heats up and stores heat; thus, the cycle is switched.

Further, the oxygen supply device adopts cryogenic method or pressure swing adsorption method to produce oxygen, the purity of oxygen is ≥90%, and the pressure is 0.05-0.2 MPa.

Further, step 1) uses air to support combustion in the initial stage, the air enters the glass kiln from the non-catalytic converter A, the natural gas directly enters the glass kiln, the air and natural gas are burned in the glass kiln, and the flue gas produced by the combustion passes through the non-catalytic Converter B heats up and stores heat for non-catalytic converter B, and then enters the flue gas recovery device to recover heat, remove dust, and desulfurize, and then introduces high-temperature flue gas fan into non-catalytic converter A, and then enters the glass furnace. At the same time, the glass furnace Oxygen is also introduced into the interior, and the mixed combustion of circulating flue gas and oxygen is used to gradually replace air for combustion; after a period of time, the non-catalytic converter A/B is switched, the air enters the glass kiln from the non-catalytic converter B, and the natural gas directly enters the glass kiln Furnace, air and natural gas are burned in the glass kiln, and the flue gas produced by the combustion passes through the non-catalytic converter A to heat up and store heat for the non-catalytic converter A, and then enters the flue gas recovery device to recover heat, remove dust, and desulfurize The flue gas fan is introduced into the non-catalytic converter B, and then enters the glass kiln. At the same time, oxygen is also introduced into the glass kiln, and the circulating flue gas and oxygen are used for combustion support, gradually replacing air combustion support; such cycle switching; after a period of circulation, The circulating flue gas is rich in water vapor and carbon dioxide, and the circulating flue gas and oxygen completely replace the air for combustion, and the system enters a normal operating state.

Further, in steps 2)-5), the non-catalytic converter A/B is switched every 20 minutes, 0-17 minutes is the conversion and reforming stage, 18-20 minutes is the flue gas purging stage, and 0-20 minutes is the Heating stage of the reformer.

Further, the oxygen content limit in the circulating flue gas in step 2) is set to 2%.

Further, step 2) when the oxygen content in the circulating flue gas is greater than the set content limit, the natural gas enters the furnace from the upper part of the non-catalytic converter A, that is, from the position 1/5 to 1/3 from the top of the non-catalytic converter A into the furnace.

Further, in steps 2), 3) and 5), oxygen is sent into the glass furnace by an oxygen lance.

Further, the circulating flue gas after heat recovery, dust removal, and desulfurization in step 4) is pressurized by a high-temperature flue gas fan to 0.05-0.2 MPa, and then introduced into the non-catalytic converter A for circulation.

Further, the system required for combustion also includes an intelligent control system, which is used to control the switching of the non-catalytic converter A/B, control the switching of natural gas into the non-catalytic converter A/B, and the glass kiln; adjust the flow of oxygen into the glass kiln Furnace flow, adjust the flow of circulating flue gas into non-catalytic converter A/B, adjust the flow of natural gas into non-catalytic converter A/B and glass furnace, so as to control the temperature and pressure of glass furnace.

Further, the combustion also includes the use of circulating flue gas to isolate and replace the raw material feeding system, and the use of circulating flue gas to isolate the parts of the glass furnace that are prone to air leakage, including the glass furnace feeding port and flame observation. Mouth, flue, isolation methods include air seal, air curtain.

Beneficial effects of the present invention:

1. The present invention circulates part of the glass kiln flue gas to increase the concentration of water vapor and carbon dioxide in the circulating flue gas. The water vapor and carbon dioxide in the circulating flue gas and natural gas undergo conversion and reforming reactions in a non-catalytic converter. The endothermic reaction of natural gas conversion and reforming recovers the sensible heat of high-temperature flue gas, and at the same time produces high-calorific-value water gas (carbon monoxide and hydrogen) above 1300°C, which increases the total calorific value and furnace temperature of gas entering the glass kiln. High-calorific-value water gas, A small amount of natural gas and oxygen that have not undergone conversion and reforming reactions are fully burned in the glass furnace, which reduces fuel consumption and improves heat recovery efficiency. The invention has excellent performances in production increase, energy saving and emission reduction, can reduce unit heat consumption and comprehensive energy consumption, increase production, reduce flue gas emission, and realize ultra-low emission _{of NOx} .

2. The present invention uses circulating flue gas and oxygen instead of air to support combustion, greatly reducing the generation of _NOx , reducing environmental pollution, and greatly reducing the cost of denitrification.

3. According to the characteristics of gas radiation, only triatomic and polyatomic gases have radiation ability, and diatomic gas has almost no radiation ability. The higher the proportion of nitrogen gas without radiation ability, the smaller the blackness of furnace gas, which affects the effect of furnace gas on glass. liquid radiation. Using circulating flue gas and oxygen to replace air for combustion, greatly reducing the content of N ₂ , using flue gas circulation to increase the concentration of water vapor and carbon dioxide in the furnace, and at the same time non-catalytic conversion to produce hydrogen and carbon monoxide, greatly improving the blackness of furnace gas and The radiation intensity of the batch material and glass liquid can increase the flame temperature and reduce the blackness of exhaust smoke, accelerate the combustion speed, shorten the melting time, promote complete combustion and increase the melting rate.

4. The present invention is provided with a non-catalytic converter A and a non-catalytic converter B. When the non-catalytic converter A is used for conversion and reforming reactions, the non-catalytic converter B uses the high-temperature flue gas at the outlet of the glass kiln to heat up and store heat. Provide heat for the next conversion and reforming reaction; when non-catalytic converter B is used for conversion and reforming reactions, non-catalytic converter A uses the high-temperature flue gas at the outlet of the glass kiln to heat up and store heat for the next conversion and reforming reaction Heat is provided during the reaction; non-catalytic converter A and non-catalytic converter B are cyclically switched, which improves heat utilization and speeds up work efficiency.

5. After the system of the present invention enters the normal operating state, it is divided into three stages: the transformation and reforming stage, the flue gas purging stage and the reformer heating stage; in the transformation and reforming stage, the water vapor in the circulating flue gas and the Carbon dioxide is used as a raw material, and it undergoes conversion and reforming reactions with natural gas in a non-catalytic converter to generate carbon monoxide and hydrogen, which increases the calorific value of the fuel and improves the heat recovery efficiency; The remaining combustible gas in the furnace is to reduce fuel waste, and to avoid environmental pollution and safety risks caused by most of the flue gas containing combustible gas being discharged into the atmosphere during the heating up stage of the reformer; to achieve flue gas circulation during the heating up stage of the reformer, Use the high-temperature flue gas at the outlet of the glass kiln to store heat for the non-catalytic reformer to provide heat for the next conversion and reforming reaction.

6. In the conversion and reforming stage of the present invention, the way of natural gas entering the non-catalytic converter is adjusted according to the oxygen content in the circulating flue gas. When the oxygen content in the circulating flue gas is less than or equal to the set content limit, the natural gas Enter the furnace from the bottom of the non-catalytic converter A, and the conversion and reforming reaction is fully carried out; when the oxygen content in the circulating flue gas is greater than the set content limit, natural gas enters the furnace from the upper part of the non-catalytic converter A, shortening the conversion and reforming reaction Time, minimize the waste of raw materials caused by the combustion reaction (only heat is provided), and the safety is high.

7. The combustion of the present invention also includes the use of circulating flue gas to isolate and replace the raw material feeding system, and the use of circulating flue gas to adopt air seals, air curtains, etc. to seal the parts of the glass kiln that are prone to air leakage, including the glass kiln feeding port and the flame observation port. Isolation of , flue, etc. reduces radiation heat dissipation and air intake, which can not only avoid the generation of nitrogen oxides, but also reduce the amount of flue gas circulation, which can effectively achieve the effect of energy saving and emission reduction.

8. The optimization of the combustion environment makes the temperature distribution in the furnace more reasonable, effectively prolonging the service life of the kiln and boiler. The improvement of the combustion conditions in the glass industry also shortens the heating time of the kiln, increases the output, reduces the defective rate, and increases the yield.

9. The combustion process of the present invention can not only increase the blackness of the flame, accelerate the burning speed, increase the temperature of the flame, but also fully burn the unburned matter carried in the flue gas, and reduce the blackness of the exhaust smoke. The combustible and harmful gases formed by combustion decomposition and combustion are fully burned to reduce the generation of harmful gases. The exhaust gas temperature and exhaust gas volume are significantly reduced, reducing thermal pollution and dust emissions.

10. After the flue gas is circulated, the concentration of carbon dioxide is increased, which makes carbon dioxide capture easier and creates favorable conditions for low-cost CCUS (carbon capture, carbon storage, and carbon utilization).

Description of drawings

Figure 1 is a schematic diagram of the combustion system used in the present invention (non-catalytic converter A undergoes conversion and reforming reactions, and non-catalytic converter B heats up and stores heat).

Fig. 2 is a schematic diagram of the combustion system of the present invention (non-catalytic converter B undergoes conversion and reforming reactions, and non-catalytic converter A heats up and stores heat).

Fig. 3 is a schematic diagram of switching between non-catalytic converter A and non-catalytic converter B in the present invention.

Fig. 4 is a schematic diagram of combustion logic control in the present invention.

Detailed ways

The present invention will be further explained below in conjunction with the embodiments and the accompanying drawings. The following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention.

The mechanism of conventional air combustion:

C _m H _n +O ₂ +N ₂ →CO ₂ +H ₂ O+NO _x ;

The carbon-based oxygen-enriched (H ₂ O+CO ₂ +O ₂ ) combustion-supporting mechanism of the present invention, the conversion and reforming reaction of natural gas and circulating flue gas rich in water vapor and carbon dioxide:

combustion reaction

H ₂ +1/2O ₂ →H ₂ O+242KJ/mol

CH ₄ +2O ₂ →CO ₂ +2H ₂ O+802KJ/mol

CO+O ₂ →1/2CO ₂ +393KJ/mol

Transformation reaction

CH ₄ +1/2O ₂ →CO+2H ₂ +35.5KJ/mol

CH ₄ +H ₂ O→CO+3H ₂ -206KJ/mol

CH ₄ +CO ₂ →2CO+2H ₂ -247KJ/mol

A glass furnace combustion process with a non-catalytic converter, the system required for combustion is shown in Figure 1 and Figure 2, including a glass furnace 3, a non-catalytic converter A4, a non-catalytic converter B5, and a flue gas recovery device 7. Chimney 8, high temperature flue gas fan 6, natural gas supply device 2 and oxygen supply device 1;

Non-catalytic converter A4, non-catalytic converter B5, one pair of non-catalytic converter A4 and one non-catalytic converter B5, according to the scale of the glass furnace, multiple pairs can be flexibly set up, as shown in Figure 1 and Figure 2 There are 3 pairs, which are used for the conversion and reforming reaction of natural gas and water vapor and carbon dioxide in the circulating flue gas. At the same time, it has the function of a regenerator to recover the heat of the high-temperature circulating flue gas;

The flue gas recovery device 7 is used to recover heat, remove dust and desulfurize the high-temperature circulating flue gas from the non-catalytic converter A4/B5;

The high-temperature flue gas fan 6 is a variable-frequency high-temperature flue gas fan, which pressurizes the circulating flue gas after heat recovery, dust removal, and desulfurization into the non-catalytic converter A4/B5; the high-temperature flue gas fan 6 can also be an ordinary high-temperature flue gas fan, However, a flow regulating valve needs to be added at the outlet;

Natural gas supply device 2, which provides natural gas;

Oxygen supply device 1, which provides oxygen, selects the method of producing oxygen according to glass furnaces 3 of different scales, such as cryogenic method, pressure swing adsorption method, etc., the oxygen purity is ≥ 90%, and the pressure is 0.05-0.2MPa; for large-scale The glass kiln adopts the cryogenic method to produce oxygen. First, the air is compressed, cooled, and liquefied. Using the difference in the boiling point of the oxygen and nitrogen components, the gas and liquid are contacted on the rectification tray for mass and heat exchange. The boiling point oxygen component is continuously condensed into liquid from the steam, and the low boiling point nitrogen component is continuously transferred into the steam, so that the nitrogen content in the ascending steam is continuously increased, while the oxygen content in the downstream liquid is getting higher and higher. Thereby separating oxygen and nitrogen to obtain oxygen with a purity of more than 99.6%, the flow of oxygen is controlled by the flow control valve, and sent to the glass furnace 3 through the oxygen spray gun; After decompression, when passing through the adsorption layer of the molecular sieve adsorption tower, the nitrogen molecules are preferentially adsorbed, and the oxygen molecules remain in the gas phase to become finished oxygen; The nitrogen molecules adsorbed on the surface of the adsorbent are desorbed and sent out of the boundary area to restore the adsorption capacity of the adsorbent; thus the oxygen and nitrogen are separated to obtain oxygen with a purity of 90-95%. The flow of oxygen is controlled by the flow control valve and sent through the oxygen spray gun. Enter glass kiln 3;

The non-catalytic converter A4 and the non-catalytic converter B5 are located on both sides of the glass furnace 3 and communicate with the glass furnace 3; The outlet of the recovery device 7 is respectively connected to the chimney 8 and the high-temperature flue gas fan 6, and the high-temperature flue gas fan 6 is switched to the bottom of the non-catalytic converter A4 and the bottom of the non-catalytic converter B5;

The natural gas supply device 2 is switched and connected to the bottom of the non-catalytic converter A4, the upper part of the non-catalytic converter A4, the bottom of the non-catalytic converter B5, the upper part of the non-catalytic converter B5, and the glass kiln 3,

Oxygen supply device 1 is connected with glass furnace 3;

An oxygen content analyzer, a flow meter, a temperature sensor and a pressure sensor are installed on the pipes connecting the high-temperature flue gas fan 6 and the bottom of the non-catalytic converter A4 and the bottom of the non-catalytic converter B5, and the natural gas supply device 2 and the bottom of the non-catalytic converter A4, The upper part of the non-catalytic converter A4, the bottom of the non-catalytic converter B5, the upper part of the non-catalytic converter B5, and the pipeline connected to the glass furnace 3 are provided with a flow regulating valve and a pressure sensor, and the pipeline connected to the oxygen supply device 1 and the glass furnace 3 Set flow regulating valve and pressure sensor.

Preferably, the system also includes an intelligent control system, which is used to control the switching of the non-catalytic converter A4/B5, control the switching of natural gas entering the non-catalytic converter A4/B5, and the glass furnace 3. The schematic diagram of switching is shown in Figure 3 ; Adjust the flow of oxygen into the glass furnace 3, adjust the flow of circulating flue gas into the non-catalytic converter A4/B5, and adjust the flow of natural gas into the non-catalytic converter A4/B5 and glass furnace 3, thereby controlling the flow of the glass furnace 3 Furnace temperature, furnace pressure.

As shown in Figure 4, the combustion process includes the following steps:

1) In the initial stage, air is used to support combustion. Air enters the glass furnace 3 from the non-catalytic converter A4, and natural gas directly enters the glass furnace 3. The air and natural gas are burned in the glass furnace 3, and the flue gas generated by the combustion is converted through non-catalytic conversion. Furnace B5 heats and stores heat for the non-catalytic converter B5, and then enters the flue gas recovery device 7 to recover heat, remove dust, and desulfurize, and then introduces the high-temperature flue gas fan 6 into the non-catalytic converter A4, and then enters the glass kiln 3. Oxygen is also introduced into the kiln 3 through the oxygen spray gun, and the combustion is supported by the mixture of circulating flue gas and oxygen (carbon-based oxygen-enriched), gradually replacing air for combustion; Furnace B5 enters glass furnace 3, natural gas directly enters glass furnace 3, air and natural gas are burned in glass furnace 3, and the flue gas produced by combustion passes through non-catalytic converter A4 to heat up and store heat for non-catalytic converter A4, and then Enter the flue gas recovery device 7 to recover heat, remove dust, and desulfurize. Then, the high-temperature flue gas fan 6 is introduced into the non-catalytic converter B5, and then enters the glass furnace 3. At the same time, the oxygen spray gun is also injected into the glass furnace 3. The flue gas and oxygen are mixed for combustion, and gradually replace the air for combustion; such a cycle switch; after a period of circulation, the circulating flue gas is rich in water vapor and carbon dioxide, and the circulating flue gas and oxygen completely replace the air for combustion, and the system enters a normal operating state;

2) Conversion and reforming stage: 0 to 17 minutes is the conversion and reforming stage. When the oxygen content in the circulating flue gas is less than or equal to the set content limit of 2%, the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A4 , natural gas also enters the furnace from the bottom of the non-catalytic converter A4, and the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo transformation and reformation reactions to generate hydrogen and carbon monoxide, namely high calorific value water gas (transformation and reformation can occur above 750°C reforming reaction, and does not require a catalyst), sent into the glass furnace 3, oxygen is sent into the glass furnace 3 by the oxygen spray gun, oxygen and carbon monoxide and hydrogen generated by non-catalytic conversion, a small amount of natural gas that has not undergone conversion and reforming reaction in the glass Combustion reaction occurs in the kiln 3; when the oxygen content in the circulating flue gas is greater than 2% of the set content limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A4, and the natural gas enters the furnace from the upper part of the non-catalytic converter A4, that is, the distance is not The top 1/5~1/3 of the catalytic converter A4 enters the furnace, and the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo conversion and reformation reactions to generate hydrogen and carbon monoxide, namely high calorific value water gas, which is sent to the glass kiln Furnace 3. Oxygen is fed into glass furnace 3 by an oxygen spray gun. Oxygen reacts with carbon monoxide and hydrogen generated by non-catalytic conversion and a small amount of natural gas that has not undergone conversion and reforming reaction in glass furnace 3;

3) Flue gas purging stage: 18 to 20 minutes is the flue gas purging stage. After the conversion and reforming stage is completed, the natural gas is switched to directly enter the glass furnace 3, and the circulating flue gas enters the furnace from the bottom of the non-catalytic reformer A4 Internal purging, replacement and conversion of residual combustible gas enters the glass furnace 3, oxygen is sent into the glass furnace 3 by the oxygen spray gun, and a combustion reaction occurs;

4) Heating stage of the reformer: 0 to 20 minutes is the heating up stage of the reforming furnace. During the reforming and reforming stage and the flue gas purging stage, the high-temperature flue gas at the outlet of the glass kiln 3 enters the non-catalytic reformer B5 to raise the temperature in the furnace Heat storage, and then enter the flue gas recovery device 7 to recover heat, dust removal, and desulfurization. After that, about 20-30% of the flue gas is pressurized by the high-temperature flue gas fan 6 to 0.05-0.2MPa and then introduced into the non-catalytic converter A4 for circulation. Vent the chimney 8 or perform CCUS;

5) The non-catalytic converter A/B is switched every 20 minutes, and the non-catalytic converter A4/B5 is switched, that is, the non-catalytic converter B5 undergoes conversion and reforming reactions, and the non-catalytic converter A4 heats up and stores heat; such a cycle switching. The flue gas circulation volume accounts for about 20-30% of the total flue gas volume.

Preferably, raw materials such as silica sand, soda ash, dolomite, limestone, and thenardite in the glass kiln 3 will entrain and absorb air when they enter the glass kiln 3, and use circulating flue gas to isolate and replace the raw material feeding system to avoid raw material type production of nitrogen oxides. Use the circulating flue gas to isolate the parts of the glass furnace 3 that are prone to air leakage. The parts of the glass furnace 3 that are prone to air leakage include the feeding port of the glass furnace, the flame observation port, the flue, etc. The isolation methods include air seals, air curtains, etc., to avoid thermal nitrogen production of oxides.

Claims (10)

1. A glass kiln combustion process with a non-catalytic converter, characterized in that the system required for combustion includes a glass kiln, a non-catalytic converter A, a non-catalytic converter B, a flue gas recovery device, a chimney, and a high-temperature flue gas Fans, natural gas supply and oxygen supply;

   Non-catalytic converter A and non-catalytic converter B are located on both sides of the glass furnace and communicated with the glass furnace; non-catalytic converter A, non-catalytic converter B and the inlet of the flue gas recovery device are switched and connected, and the outlet of the flue gas recovery device Connect to the chimney and the high-temperature flue gas fan respectively, and switch between the high-temperature flue gas fan and the bottom of the non-catalytic converter A and the bottom of the non-catalytic converter B;

   The natural gas supply device is connected to the bottom of non-catalytic converter A, the upper part of non-catalytic converter A, the bottom of non-catalytic converter B, the upper part of non-catalytic converter B, and the glass furnace,

   Oxygen supply device and glass furnace connection;

   An oxygen content analyzer, flow meter, temperature sensor and pressure sensor are installed on the pipeline connecting the high-temperature flue gas fan and the bottom of non-catalytic converter A and the bottom of non-catalytic converter B; the natural gas supply device and the bottom of non-catalytic converter A and non-catalytic A flow regulating valve and a pressure sensor are installed on the upper part of the reformer A, the bottom of the non-catalytic reformer B, the upper part of the non-catalytic reformer B, and the pipeline connected to the glass furnace, and the flow regulating valve and the Pressure Sensor;

   Combustion includes the following steps:

   1) At the initial stage, air is used to support combustion. After the flue gas is generated, the circulating flue gas and oxygen are used as a combustion aid to gradually replace the air for combustion. After a period of circulation, the circulating flue gas is rich in water vapor and carbon dioxide, and the circulating flue gas Oxygen completely replaces air for combustion, and the system enters a normal operating state;

   2) Conversion and reforming stage: when the oxygen content in the circulating flue gas is less than or equal to the set content limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A, and the natural gas also enters the furnace from the bottom of the non-catalytic converter A , the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo conversion and reformation reactions to generate hydrogen and carbon monoxide, that is, high calorific value water gas, which is sent to the glass furnace, oxygen is sent to the glass furnace, and the carbon monoxide and carbon monoxide generated by the non-catalytic conversion of oxygen and Hydrogen and a small amount of natural gas that has not undergone conversion and reforming reactions undergo combustion reactions in the glass furnace; when the oxygen content in the circulating flue gas is greater than the set content limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic reformer A, and the natural gas Entering the furnace from the upper part of the non-catalytic converter A, the natural gas and the water vapor and carbon dioxide in the circulating flue gas undergo conversion and reformation reactions to generate hydrogen and carbon monoxide, namely high calorific value water gas, which is sent to the glass kiln, and oxygen is sent to the glass kiln , Oxygen, carbon monoxide and hydrogen generated by non-catalytic conversion, and a small amount of natural gas that has not undergone conversion and reforming reactions undergo combustion reactions in the glass kiln;

   3) Flue gas purging stage: After the conversion and reforming stage, the natural gas is switched to directly enter the glass kiln, and the circulating flue gas enters the furnace from the bottom of the non-catalytic converter A to purge and replace the residual combustible gas, and then enters the glass kiln Furnace, oxygen is sent into the glass kiln, and a combustion reaction occurs;

   4) Heating stage of the reformer: In the stage of conversion and reforming and flue gas purging, the high-temperature flue gas from the outlet of the glass kiln enters the non-catalytic reformer B to make the furnace heat up and store heat, and then enters the flue gas recovery device to recover heat , dust removal and desulfurization, the latter part is pressurized by the high-temperature flue gas fan and then introduced into the non-catalytic converter A for circulation, and the rest is vented by the chimney or CCUS;

   5) After a certain period of time, the non-catalytic converter A/B is switched, that is, the non-catalytic converter B undergoes conversion and reforming reactions, and the non-catalytic converter A heats up and stores heat; thus, the cycle is switched.
2. The glass kiln combustion process with a non-catalytic converter according to claim 1, wherein the oxygen supply device adopts a cryogenic method or a pressure swing adsorption method to obtain oxygen, the oxygen purity is ≥ 90%, and the pressure is 0.05-0.2 MPa.
3. The glass kiln combustion process with non-catalytic converter according to claim 1, characterized in that step 1) uses air to support combustion in the initial stage, air enters the glass kiln from the non-catalytic converter A, and natural gas directly enters the glass kiln Furnace, air and natural gas are burned in the glass kiln, and the flue gas produced by the combustion passes through the non-catalytic converter B to heat up and store heat for the non-catalytic converter B, and then enters the flue gas recovery device to recover heat, remove dust, and desulfurize The flue gas fan is introduced into the non-catalytic converter A, and then enters the glass furnace. At the same time, oxygen is also introduced into the glass furnace, and the mixed combustion of circulating flue gas and oxygen is used to gradually replace the air for combustion; after a period of time, the non-catalytic converter A is switched. /B, air enters the glass kiln from non-catalytic converter B, natural gas directly enters the glass kiln, air and natural gas are burned in the glass kiln, and the flue gas produced by combustion passes through non-catalytic converter A, which is non-catalytic converter A Heat up and store heat, and then enter the flue gas recovery device to recover heat, remove dust, and desulfurize. Then, the high-temperature flue gas fan is introduced into the non-catalytic converter B, and then enters the glass furnace. At the same time, oxygen is also introduced into the glass furnace to utilize the circulating flue gas. Mix with oxygen for combustion, and gradually replace air for combustion; such a cycle switch; after a period of circulation, the circulating flue gas is rich in water vapor and carbon dioxide, and the circulating flue gas and oxygen completely replace air for combustion, and the system enters normal operation.
4. The glass kiln combustion process with a non-catalytic converter according to claim 1, characterized in that, in steps 2)-5), the non-catalytic converter A/B is switched every 20 minutes, and 0 to 17 minutes are converted and In the reforming stage, 18 to 20 minutes is the flue gas purging stage, and 0 to 20 minutes is the reformer heating stage.
5. The glass kiln combustion process with non-catalytic converter according to claim 1, characterized in that the oxygen content limit in the circulating flue gas in step 2) is set to 2%.
6. The glass kiln combustion process with non-catalytic converter according to claim 1, characterized in that, in step 2) when the oxygen content in the circulating flue gas is greater than the set content limit, natural gas enters from the upper part of the non-catalytic converter A In the furnace, that is, it enters the furnace from a position 1/5 to 1/3 away from the top of the non-catalytic converter A.
7. The glass kiln combustion process with non-catalytic converter according to claim 1, characterized in that, in steps 2), 3) and 5), oxygen is sent into the glass kiln by an oxygen spray gun.
8. The glass kiln combustion process with non-catalytic converter according to claim 1, characterized in that the circulating flue gas after heat recovery, dust removal and desulfurization in step 4) is pressurized to 0.05-0.2 MPa by a high-temperature flue gas fan Afterwards, it is introduced into the non-catalytic converter A for circulation.
9. The glass kiln combustion process with a non-catalytic converter according to claim 1, wherein the system required for combustion also includes an intelligent control system, which is used to control the switching of the non-catalytic converter A/B and control the natural gas Switching of entering non-catalytic converter A/B and glass furnace; adjusting the flow rate of oxygen entering the glass furnace, adjusting the flow rate of circulating flue gas entering non-catalytic converter A/B, and adjusting the flow of natural gas entering non-catalytic converter A/B, The flow rate of the glass furnace can be controlled to control the temperature and pressure of the glass furnace.
10. According to claim 1, the glass kiln combustion process with a non-catalytic converter is characterized in that the combustion also includes the use of circulating flue gas to isolate and replace the raw material feeding system, and the use of circulating flue gas to facilitate the glass kiln The air leakage parts are isolated, and the air leakage parts of the glass furnace include the feeding port of the glass furnace, the flame observation port, and the flue. The isolation methods include air seals and air curtains.

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